/* Copyright  2009
   @Author
   Richard Changde Yin            e-mail yinchangde@hotmail.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
   
/**
 * @filename: item/cache.cc
 */   

#include <server_includes.h>
#include CSTDINT_H
#include <item/cache.h>
#include <item/cache_row.h>
#include <item/cache_int.h>
#include <item/cache_real.h>
#include <item/cache_decimal.h>
#include <item/cache_str.h>

Item_cache* Item_cache::get_cache(const Item *item)
{
  switch (item->result_type()) {
  case INT_RESULT:
    return new Item_cache_int()    ;
  case REAL_RESULT:
    return new Item_cache_real()   ;
  case DECIMAL_RESULT:
    return new Item_cache_decimal();
  case STRING_RESULT:
    return new Item_cache_str(item);
  case ROW_RESULT:
    return new Item_cache_row()    ;
  default:
    // should never be in real life
    assert(0);
    return 0;
  }
}


void Item_cache::print(String *str, enum_query_type query_type)
{
  str->append(STRING_WITH_LEN("<cache>("));
  if (example)
    example->print(str, query_type);
  else
    Item::print(str, query_type);
  str->append(')');
}

bool Item_cache::eq_def(Field *field)
{
  return cached_field ? cached_field->eq_def (field) : false;
}

